HD DVD (short for High-Definition/Density DVD) is a discontinued high-density optical disc format for storing data and high-definition video. Supported principally by Toshiba, HD DVD was envisioned to be the successor to the standard DVD format. However, in February 2008, after a protracted high definition optical disc format war with rival Blu-ray Disc, Toshiba abandoned the format, announcing it would no longer develop or manufacture HD DVD players or drives. However, the HD DVD physical disc specifications (but not the codecs) are still in use as the basis for the CBHD (China Blue High-Definition Disc) formerly called CH-DVD. The HD DVD Promotion Group was dissolved on March 28, 2008.

Because all variants except 3× DVD and HD REC employed a blue laser with a shorter wavelength, HD DVD could store about 3.2 times as much data per layer as its predecessor (maximum capacity: 15 GB per layer instead of 4.7 GB per layer).

In the mid 1990s, commercial HDTV sets started to enter a larger market. However, there was no inexpensive way to record or play back HD content. JVC's D-VHS and Sony's HDCAM formats could store that amount of data, but were neither popular nor well-known. However, it was well known that using lasers with shorter wavelengths would yield optical storage with higher density. Shuji Nakamura invented practical blue laser diodes, however, a lengthy patent lawsuit delayed commercial introduction.

Stefani Joanne Angelina Germanotta (/ˈstɛfəniː dʒʌrməˈnɑːtə/ STE-fə-nee jurr-mə-NAH-tə; born March 28, 1986), known by her stage name Lady Gaga, is an American singer and songwriter. Born and raised in New York City, she primarily studied at the Convent of the Sacred Heart and briefly attended New York University's Tisch School of the Arts before withdrawing to focus on her musical career. She began performing in the rock music scene of Manhattan's Lower East Side, and was signed with Streamline Records by the end of 2007. During her employment as a songwriter for the record company, her vocal abilities captured the attention of recording artist Akon, who signed her to his label Kon Live Distribution.

Lady Gaga came to prominence as a recording artist following the release of her debut album The Fame (2008), which was a critical and commercial success that topped charts around the world and included the international number-one singles "Just Dance" and "Poker Face". After embarking on the The Fame Ball Tour, she followed the album with The Fame Monster (2009), which spawned the worldwide hit singles "Bad Romance", "Telephone" and "Alejandro". The album's success allowed her to embark on the eighteen-month long Monster Ball Tour, which later became one of the highest-grossing concert tours of all time. Her most recent album Born This Way (2011) topped the charts of most major markets and generated more international chart-topping singles, including "Born This Way", "Judas" and "The Edge of Glory". Besides her musical career, she involves herself with humanitarian causes and LGBT activism.

Maria Rita Camargo Mariano (Portuguese pronunciation: [maˈɾiɐ ˈʁitɐ]; born September 19, 1977, in São Paulo, Brazil) is the performance name of Maria Rita Mariano, a Brazilian singer. She is the daughter of famed pianist/arranger César Camargo Mariano and the late Brazilian singing legend Elis Regina and sister to Pedro Mariano and music producer João Marcelo Bôscoli. Her namesake is family friend and famed Brazilian rock legend Rita Lee. Maria Rita majored in Latin American studies and communications at New York University, and worked as a journalist at a magazine for adolescents.

Maria Rita began singing professionally at the age of 24, although she had wanted to sing since she was 14. Her first CD, Maria Rita, launched her career symbolically, with the first cut on her first album, A Festa (The Party), being written by Milton Nascimento, a Brazilian singer-songwriter whose career was launched by Maria Rita's mother, Elis Regina. The CD went platinum and was a hit worldwide, making her an international star. Her mother's reputation as one of Brazil's greatest female singers has been a major influence in Maria Rita's life although she respectfully avoids the songs identified with her mother; she has said that she was always conscious of being the only daughter of a great singer. Despite having her mother's vocal DNA, she has developed her own jazzy vocal style, with singers like Ella Fitzgerald as her model.